Braided driving belt



P. F'. MITTERWAY BRAIDED DRIVING BELT April 17, 1951 Filed July 22, 19219 Y f .Y v f x .m 12 13 11Y 11 15 12 FIG. 5 P P1 1o INI/EN TOR.

77u71); E maffenmy Patented Apr. 17, 1951 BRAIDED DRIVING BEL'Il Philip F. Mitterway, PrinceBay, .N.'Y., assignor to The S. S. White Dental Manufacturing Company, a corporation of Pennsylvania Application July 22, 1949, Serial No. :106,129

Myvinvention relates particularly to machine driving belts and is directed more speciiically to endless belts of the type employed especially in connection with dental engines for transmitting motion from a driving pulley to a driven pulley serving to rotate burs, drills, disks, etc.

In the actuation of such apparatus, it is of the utmost importance that the connected ends of the driving belt whenpassing over the multiplicity of pulleys including the driving pulley keyed to the armature shaft of the motor and the driven pulley mounted on the spindle which is carried by the hand piece do not impart detrimental vibrations to the hand piece, and consequently to the bur or implement attached to the spindle.

The principal objects of my invention are to provide a novel method of connecting the ends of i splice, and will appear from the following de-v tailed description.

My invention also includes all of the various novel features of construction and arrangement A as hereinafter more denitely specified.

In the accompanying drawings, Figure l is an elevational view showing a portion of a braided machinevbelt ready for the making of the connecting splice joint, the outer disposed covering or sleeve being shown partly in vertical longitudinal section, for convenience of illustration; Fig. 2 is a similar view showing the outer covering retracted from the position shown in Fig. l so as to uncover one end of the core, and showing a tool in the form of a slitted needle in position in the uncovered core portion for drawing another core portion which is formed at the opposite end of the covering in telescopic relation with the interior of the uncovered core portion; Fig. 3 is a similar View showing the core portion formed with the outer covering, telescopically engaged longitudinally within the previously uncovered core portion, the outer covering being shown at one end in longitudinal vertical section; Fig. 4 is an enlarged side elevational view of the belt showing the joint portion drawn partly over the two telescoped core portions of the belt with aportion of the outer covering being shown in section; and Fig. 5 is an elevational view of the completed joint showingv the ends of the outer covering s claims. (01.87-13) y 2 brought into abutted relation against each other to form the completed endless belt.

In said iigures, the machine driving belt to which the connecting or splicing method of my invention is particularly well adapted for use as shown in Figure l, consists of a'braided outer disposed covering or sleeve Ill providing but for a relatively small length as indicatedbetween the points P and PI, a complete annulus. .The sleeve I0 at point PI emerges into the form of a contiguously braided hollow core portion II, the end of which in turn terminates in an unravelled portion I IY, with the threads fanned out.

The opposing end portion of sleeve I from point P is reduced in diameter to be connected with the hollow core I2, extending in position concentric to the sleeve Ill and protruding through an opening It, at point P to form the core end portion I3 normally extending a relatively small length to terminate like core I I with the unravelled thread portion I 5 thus forming, in cooperation with the covering or casing I0, a helix or loop in concentric relation to each other.

According to the method of joining the ends of the machine belt constructed as above described,V

the core portion I3 is uncovered for a suitable disseen in Figs. 2 and 3, to cause the latter to form A a series of annular corrugations Il.

Atool l, which is in the form of a slittedV needle, is then inserted into this core I3 to the position as shown in Fig. 2 when the unbraided threads IIY of core portion II are engaged in the slit of the needle for drawing this core portion Il longitudinally into the core portion I3 in position as shown in Figs. 3 `and 4, which ac- Y tion `is followed by cutting 01T the unbraided thread ends of core portion i IY to approximately one-half inch from its braided portion in staggered relation to each other, then by slightly withdrawing the core I I from the end portion of the sleeve I3 an amount'suicient to position or locate all its unbraided threads into the sleeve end portion I3, as best shown in Fig. 3 when'the unbraided threads I5 at the end portion of the core I3 are cut in a staggered relation to each other so as to avoid any sharp difference in diameter along the length of the completed spliced joint.

The end of the sleeve portion I0 adjacent to the uncovered core portion I3 is then pulled 1ongitudinally over the now telescoped core end portions yII and I'S, as shown in Fig. 4, which causes the sliding telescopic vmovement of the sleeve I0 to a point limited by the intersections formed by the core portions H and I3 at points P and PI, thus forcing the terminating ends of sleeve covering l0 into closely abutted relation against each other, whereby forming a spliced joint which is substantially invisible to the naked eye, and of a diameter substantially uniform throughout the length of the belt, and which is smooth and comparatively stronger than the unspliced portion of the belt.

I do not desire to limit my invention to the precise details of construction and arrangement as herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of my invention as dened in the appended claims.

Having thus described my invention, I claim:

1. The method of connecting the opposed ends of a helix formed machine belt having a core and a braided sleeve covering concentrically disposed to each other, one end of the core protruding through the sleeve at a point adjacent another core portion formed at the opposite end of the sleeve, the step in said method which consists in uncovering one end of the core by retracting a given length of the braided covering, puncturing the uncovered portion of the core with a tool in the form of a slitted needle, passing any unbraided threads of the core portion which is formed with the outer end portion of the covering into the slit of the needle and telescopically engaging the latter core into the uncovered portion of the core by retracting the needle.

2. The method of connecting the opposed ends of a helix formed belt having a contiguously formed core and abraided sleeve disposed in concentric relations to each other, the second step in said method which consists of cutting any unbraided threads from both ends of the core portions in staggered relation to a length substantially half the distance of the uncovered core portion and lwithdrawing the threads of the inner disposed core into the outer disposed core portions for progressively decreasing the outer diameter of the telescoped core portions.

3. The method of forming a connection between the opposed ends of a helix coiled belt having a contiguously formed braided core and a sleeve disposed in concentric relation to each other, the steps in said method consisting in uncovering the end of the core a given length by retracting the outer braided covering, puncturing the uncovered portion of the core a given distance from its free end by inserting a tool in this portion of the core in the form of a slitted needle, engaging the unbraided threads at the end of another core portion which is formed at the opposite end of the sleeve into the slitted portion of the needle, withdrawing the needle for telescopically engaging such core into the uncovered core portion starting from the free end of the latter, cutting the unbraided threads from both ends of the core portions in staggered relation, withdrawing the inner core to locate its unbraided threads into the outer'disposed core portion, and pulling the retracted portions of the outer covering over the joint to a point wherein the intersections formed by one of the core portions and the ends of the outer covering are in tight abutment against each other.

PHILIP F. MITTERWAY.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 296,377 Atwood Apr. 8, 1384 338,216 Atwood Mar. 16, 1886 

